In his now-classic work The Myth of the Rational Voter, Bryan Caplan identifies four systematic biases about economics held by the average citizen: make-work bias (an inclination to overestimate the disadvantages of temporary job destruction due to productivity increases), anti-market bias (a tendency to overlook the benefits of the market as a coordination mechanism), pessimistic bias (an inclination to underestimate the present and future performance of the economy), and anti-foreign bias (a tendency to underestimate the economic benefits of interaction with foreigners).

Widespread biases on economics are far from being harmless. Wrong ideas held by voters usually lead to catastrophic policies due to the inherent nature of the democratic process. In other words, in most cases, politicians undertake those policies that they deem popular among voters in order to get reelected. If those policies beget pernicious consequences for the economy, harmless beliefs turn into lower living standards for all.

Of those four biases, the most potentially harmful is the anti-foreign bias. This inclination to underestimate the benefits of economic cooperation with foreigners manifests itself politically in two main ways: protectionism and anti-immigration policies. Despite the recent surge of protectionism in some developed countries, free trade is now the rule rather than the exception in most parts of the world. However, when it comes to immigration, only a few steps have been taken worldwide over the last few decades in a direction of liberalization (even though the consensus about the benefits of more open borders in the economics profession is probably as strong as the consensus around free trade).

As I will show in this series of two articles [see the second article here], anti-immigration policies reduce the well-being of both potential immigrants and host societies, as shown by economic theory and empirical evidence. Or, to put it differently: even a partial liberalization of immigration restrictions would, in the long-term, contribute to improving the standards of living globally.

Economic Theory Supports Immigration-Friendly Policies

The economic case against less restrictive immigration policies rests on shaky pillars. The most common anti-immigration arguments are related to the supposedly negative effects that immigration has on the host country’s labor market, and, more specifically, its impact on employment and wages. According to advocates of immigration restrictions, immigrants do not only take natives’ jobs, but also have a depressive effect on wages.

However, economic theory does not support these assertions. First, the economy is not a zero-sum game: the numbers of jobs available is not finite. As pointed out by Alex Tabarrok (here and here), immigrants are not only producers but also consumers, which implies that an increase in demand triggered by the expansion of the immigrant population goes hand in hand with an increase in total employment. Also – and contrary to conventional wisdom – not only highly-qualified immigrants create positive externalities on host economies. Low-skilled immigrants tend to take lower-productivity jobs (as they often either lack higher education or do not speak the language), allowing the native-born to access higher-productivity jobs (assuming free trade and a flexible labor market).

All said above can be also applied to wages. All else equal, the law of supply and demand says that an increase in the supply of labor would inevitably cause lower wages. However, more immigrants also mean a higher demand for goods and services, which in turn results in a higher demand for labor, preventing a generalized decrease in salaries. Even in those cases when wages in a particular sector are temporarily pushed down, lower wages lead to lower costs for companies, which usually results in lower prices for consumers due to the process of competition.

Immigration-friendly policies can also help tackle the demographic problem that many developed countries have been experiencing over the last years. For instance, the progressive demographic ageing of the American population is already having an impact on the US Social Security system. According to the Population Reference Bureau, the number of Americans over 65 years old will have moved from 15% in 2014 to 24% of the population by 2060. As a result, the worker-to-beneficiary ratio will decrease by 32%, from 3.4 in 1990 to 2.3 in 2030. This problem could be mitigated by adopting a more flexible immigration policy that increases the working population, reversing the trend that will otherwise end up with significant spending cuts in Social Security benefits.

Benefits for the Sending Countries and Immigrants

The discussion so far has focused on the benefits of immigration for receptor countries. How do the sending countries and immigrants benefit from the migratory phenomenon? Immigrants usually transfer part of their income to their countries of origin with the aim of economically supporting their families and friends. These so-called remittances are flows of capital from developed to developing countries which assist in the economic development of sending countries.

The main beneficiaries of eliminating barriers to labor mobility would be, no doubt, immigrants themselves. This is due to the concept of Place Premium. This concept, first introduced by Michael Clemens, Claudio E. Montenegro, and Lant Pritchettin in a 2008 paper, refers to the automatic increase in earnings (PPP adjusted) that a worker experiences by moving from a low-productivity country to a high-productivity country, without increasing the worker’s human capital. The factors behind this phenomenon are multiple: differences in capital accumulation, quality of infrastructures, technology, proximity to high-productive workers, different legal frameworks, etc. The empirical evidence (which will be dealt with in the second and final article of this series) shows that wage differences among countries due to Place Premium are immense. The corollary is simple: more open borders would bring about a substantial reduction in poverty levels across the world.

Potential Gains from Reducing Global Migration Barriers

What would happen if migration barriers were partially or totally eliminated on a global scale? In his paper Economics and Immigration: Trillion-Dollar Bills on the Sidewalk, Michael Clemens, senior fellow at the Center for Global Development, reviews the academic literature on the topic. If all barriers to labor mobility were to be removed, world GDP would increase in the range of 50% to 150%.

Even partial liberalizations would bring about considerable gains. For instance, a reform that allowed 7% of the population to emigrate to higher-productivity countries would result in an efficiency gain of 10% of world GDP. To put this into perspective, if all remaining trade barriers were eliminated, world GDP would grow by just 2% or 3%. As shown, the impact of relaxing migration barriers on the world economy would be extremely positive, especially for the poorest segments of population.

The theoretical analysis above clearly supports the adoption of more immigration-friendly policies as a way of increasing economic growth and improving the welfare of millions and millions of people, including those in receptor countries. However, economic theory needs to be supported by facts. In my next article, I will provide empirical evidence in support of eliminating barriers to immigration.

Luis Pablo de la Horra is a Spanish finance graduate from Vlerick Business School.